//
//  MainTabBar.swift
//  Weibo
//
//  Created by 李洋 on 15/12/13.
//  Copyright © 2015年 Leon. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
     override init(frame: CGRect) {
        
        super.init(frame:frame)
        addSubview(composeBtn)
    }

    //通过 xib/sb 创建视图会调用这个方法
    //如果实现了 init(frame)就意味着使用手写代码创建 就不会调用这个方法
     required init?(coder aDecoder: NSCoder) {
         //fatalError("init(coder:) has not been implemented")
        super.init(coder: aDecoder)
     }
    
    
    override func layoutSubviews() {
        super.layoutSubviews()
        let w = bounds.width / 5
        let h = bounds.height
        let rect = CGRectMake(0, 0, w, h)
        
        var index: CGFloat = 0
        for subview in subviews {
            if subview.isKindOfClass(NSClassFromString("UITabBarButton")!){
                subview.frame = CGRectOffset(rect, index * w, 0)
                index += (index == 1 ? 2 : 1)
            }
        }
        //设置加号按钮的 frame
        composeBtn.frame = CGRectOffset(rect, 2 * w, 0)
    }
    
    //懒加载 加号按钮
    lazy var composeBtn: UIButton = UIButton(imageName: "tabbar_compose_icon_add", backImageName: "tabbar_compose_button")


}
